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On the propagation of two types of disturbances through a laminar boundary layer subjected to separation and transition

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posted on 2023-06-10, 00:48 authored by Thomas IrpsThomas Irps, Vasudevan KanjirakkadVasudevan Kanjirakkad
The propagation of two types of artificial disturbances within a boundary layer is discussed. The boundary layer is initially laminar but later transitions to become turbulent through the formation of a separation bubble under the influence of an imposed adverse pressure gradient. The growth of the boundary layer and that of the disturbances within it are tracked experimentally using hotwire anemometry measurements. The effects of the interaction of the disturbances with the separation bubble are captured using both hotwire and particle image velocimetry measurements. For a chord based Reynolds number of 210 k it is shown that Kelvin–Helmholtz shedding frequencies over the bubble are unchanged in the presence of either of the disturbances and are comparable to the steady flow case with no disturbances present. Both disturbances produced an extensive calmed region on interacting with the bubble. The calmed region due to the bar wake is relatively longer and persistent. The upstream location of the separation bubble formation is unaffected by the disturbances, however the average size of the bubble is shown to be sensitive to the type of disturbance with the bar wake producing a thinner and shorter bubble.

History

Publication status

  • Published

File Version

  • Accepted version

Publisher

Springer

Volume

38

Page range

407-418

Pages

836.0

Book title

IUTAM laminar-turbulent transition: 9th IUTAM symposium, London, UK, September 2–6, 2019

Place of publication

Cham

ISBN

9783030679019

Series

IUTAM Bookseries

Edition

1

Research groups affiliated with

  • Thermo-Fluid Mechanics Research Centre Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Editors

Xuesong Wu, Spencer Sherwin, Peter Schmid

Legacy Posted Date

2021-08-31

First Open Access (FOA) Date

2022-08-01

First Compliant Deposit (FCD) Date

2021-08-31

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